Environment Configuration Checker

Compare .env and .env.example for missing keys, extras, value drift, and secret-named variables. Client-side dotenv checker.

Introduction

Environment Configuration Checker is a free, browser-based utility in our Validator Tools collection. Compare two dotenv-style configs (for example .env.example vs .env). See keys only on one side, shared keys with different values, empty values, and keys whose names look secret — all client-side. Environment Configuration Checker catches env drift before deploy: missing keys from the example file, unexpected extras, and renamed secret variables. It parses KEY=value lines (including export PREFIX) without sending values to a server. Use Config Generators when you need a starter .env, then this checker to validate environments against each other. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include side-by-side .env compare.

Features

Side-by-side .env compare
Missing and extra key detection
Changed shared values
Empty-value highlights
Secret-named key hints

How to use

1
Paste .env.example (or staging) on the left.
2
Paste the other environment on the right.
3
Review chips and the text report, then copy if needed.

Example

Missing SENTRY_DSN in example

Input

A has PORT; B has PORT + SENTRY_DSN

Output

Only in B: SENTRY_DSN

Benefits

Run Env Checker entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Side-by-side .env compare
Missing and extra key detection
Changed shared values
Pair it with Configs and .gitignore when your workflow needs adjacent utilities.

FAQs

No. It only parses and compares text.

Simple single-line KEY=value entries are supported. Complex multiline shells may need cleanup first.

No. Comparison runs locally.

Yes. Env Checker on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. Env Checker runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Compare two dotenv-style configs (for example .env.example vs .env). See keys only on one side, shared keys with different values, empty values, and keys whose names look secret — all client-side. It fits everyday validator tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Side-by-side .env compare; Missing and extra key detection; Changed shared values; Empty-value highlights.

Developers often pair Env Checker with Configs, .gitignore, Text Diff. Open Related tools on this page for quick links.